Filter.



' ,PATBNTED APR. 26, 1904.

0.SBLG.

FILTER.l

APPLIOAHON FILED SEPT. 1-1, 1903.

A N0 MODEL.

Fig. 3Q

Patented April 2S, 1904.

ATENT OFFICE.

OTTO sELG, OE NEW' YORK, N. Y.

FILTER.

SPECIFICATION forming part of Letters Patent No. 758,390, dated 'April 26, 1904.`

Application filed September 11, 1903. Serial No.`172,736. (No model.) l

To @ZZ whom, t may concern:

Be it known that I, OTTO SELG, a citizen of the United States, residing at New York city, Brooklyn, county of Kings, and State of New York, have invented new and useful Improvements in Filters, of which the following is a specification. i

This invention relates to a filter which is so with water, the cock d2 is opened, the cock CZ' constructed that the strainer is not apt to become clogged and that a free percolation the liquid is always insured.

In the accompanying drawings, Figure l is a side' elevation, partly in section, ot' a mashtub embodying my invention; Fig. 2, a section on line 2 2, Fig. 1; Fig. 3, a section on-line 3 3,

Fig. i; Fig. 4, a vertical section of a modification of the mash-tub; and Fig. 5, asection on 'line 5 5, Fig. 4. Y f

The letter c represents the body or shell of a filter, such as a mash-tub, having a curved strainer b above its curved bottom c', so as to form an intervening filtering-chamber c2. A

" central opening in the strainer 71 and bottom A thence out through pipe (l. With the construction thus far described asuction is apt to be created in the filtering-chamber c2,- which will pack the. grain tightly upon the strainer Z1, and thus prevent the eicient operation of the apparatus. In other words, as the grain gradually settles on the strainer Z) the' discharge through pipe Z diminishes, and when the filtrate will no longer run sufciently quick to fill the same a suction willbe created inthe pipe, and consequently in the chamber a2, beneath the strainer This suction will draw the grain into the meshes of the filter, and thus pack or clog the sam e. To overcome this objection, I connect the pipe CZ between its inlet and discharge ends with a U-shaped trap or pipe having two legs e f, of unequal in vessel a.

In drawing ott the 'filtrate the pipe f is filled Y chamber c2 corresponds to that of leg e, it follows that the chamber a2 must always remain filled.u Consequently if the grain should settleupon the strainer the flowof the liquid through the pipe e' would be gradually di minished, but no suction would be created in chamber ai, so that the grain is not drawn against andinto the meshes of the strainer.

The liquid-level in the stand-pipe f will of course correspond to that of the liquid-level y Consequently the pressure in the vessel c will be counterbalanced by that in pipe f, and the grain will not be apt to be packed against the. strainer by the top pressure. Thus by the joint action of' the upper Ydischarge-pipe and the stand-pipe any packing of the filtering material against the strainer either by suction or pressure is avoided, and

a free percolation is at 'all times insured.

After the level of the liquid inV vessel a has sunk to the 'levelofthe strainer the cock c2 chamber below the same, a discharge-pipev communicating With the bottom of saidohambei', a U-shaped trap communicating with the discharge-pipe and having two legs of unequal length, one of said legs constituting a stand- 5 pipe, and the second leg extending rst up- Ward and then sdewise to form a second discharge-pipe, substantially as specified.

Signed by me at New York city, (Manhattan,) New York, this 10th day of September, 1903.

OTTO SELG. Witnesses:

WILLIAM SCHULZ, FRANK V. BRIESEN. 

